I'm not sure if this is the right place or maybe classic Buick might be better. I had the trans rebuilt a few years ago only for leaks. Was working fine otherwise. So I can't take it back. Plus I moved. The switch pitch didn't work after the rebuild. I never noticed it until accelerating hard one day and then we moved shortly after. I have all the manuals, but thought someone might have some input on where to start? From what I understand these trans never shift unless done so manually. They accelerate off the torque converter.